package com.max.xihu.netty.nio.websocket;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.util.concurrent.GlobalEventExecutor;

import java.time.LocalDateTime;

/**
 * @Author: Max
 * @Date: 2020-03-08 22:41
 * @Description:
 */
public class ChatHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> {



    private static ChannelGroup clients =
            new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);


    @Override
    protected void channelRead0(ChannelHandlerContext context, TextWebSocketFrame msg)
            throws Exception {

        String text = msg.text();
        System.out.println("接受到的数据："+text);

//        for (Channel channel : clients){
//            channel.writeAndFlush(
//                    new TextWebSocketFrame("[服务器在]"+ LocalDateTime.now()
//                    +"接受到消息，消息为："+text));
//        }

        //这个方法和上面的for循环功能一致
        clients.writeAndFlush(
                new TextWebSocketFrame("[服务器在]"+ LocalDateTime.now()
                        +"接受到消息，消息为："+text));

    }

    /**
     * 当客户端连接服务端之后（打开连接）
     * 获取客户端的channel，并且放到ChannelGroup中进行管理
     * @param ctx
     * @throws Exception
     */
    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        clients.add(ctx.channel());
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
       //当触发handlerRemoved，ChannelGroup会自动移除对应客户端的channel
        //clients.remove(ctx.channel());
        System.out.println("客户端断开，channel对应的长id："
                +ctx.channel().id().asLongText());
        System.out.println("客户端断开，channel对应的短id："+ctx.channel().id().asShortText());
    }
}
